Compression Release

Does engine 406777-0442-B1 DoM 03/10/2010 have compression release?

When I click on the part number link above a cam shaft for a single cylinder engine comes up. that cannot possibly be right. Then i googled the number and the correct cam shaft comes up. Weird!!!!
Anyway, does this compression release apply to both cylinders?

As you all may remember, I did a ring job just a few months ago and had the engine all open. I always thought that the mower had to struggle to get started and then I saw a post from someone with a very similar problem and now i suspect that the compression release may be the culprit. Dang, I guess I need to open her up again to check that gizzmo on the cam shaft. It never even dawned on me to do that when I had the chance. That's the school of hard knocks, I guess! But I understand there are ways to check this without having to open up the crank case.